HeartSaVioR commented on a change in pull request #28904:
URL: https://github.com/apache/spark/pull/28904#discussion_r471885971



##########
File path: 
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/CompactibleFileStreamLog.scala
##########
@@ -173,37 +177,64 @@ abstract class CompactibleFileStreamLog[T <: AnyRef : 
ClassTag](
   override def purge(thresholdBatchId: Long): Unit = throw new 
UnsupportedOperationException(
     s"Cannot purge as it might break internal state.")
 
+  /**
+   * Apply function on all entries in the specific batch. The method will throw
+   * FileNotFoundException if the metadata log file doesn't exist.
+   *
+   * NOTE: This doesn't fail early on corruption. The caller should handle the 
exception
+   * properly and make sure the logic is not affected by failing in the middle.
+   */
+  def foreachInBatch(batchId: Long)(fn: T => Unit): Unit = 
applyFnInBatch(batchId)(_.foreach(fn))
+
+  /**
+   * Apply filter on all entries in the specific batch.

Review comment:
       ditto. Would we want to mention all possible exceptions per method? 
`IllegalStateException` is the explicit one, but there're also many possible 
exceptions, starting from `IOException`.




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